Fig. 1. (a) The weight loss ratio and (b) thickness change of thick Sn film after chemical etching according to the concentration of nitric acid.
Fig. 3. FE-SEM images of the chemically-etched Sn foils for 60 seconds: (a) pristine, (b) 2 M HNO3, (c) 3 M HNO3, and (d) 4 M HNO3.
Fig. 4. 3D-profiles from optical microscope of the chemically-etched Sn foils for 60 seconds: (a) 2 M HNO3, (b) 3 M HNO3, and (c) 4 M HNO3.
Fig. 5. (a) The galvanostatic charge/discharge voltage profiles and (b) the differential discharge capacity plots at first cycle obtained from Li/Sn-film half-cells.
Fig. 2. Optical microscope images of the chemicallyetched Sn foils for 60 seconds: (a) pristine, (b) 2 M HNO3, (c) 3 M HNO3, and (d) 4 M HNO3.
Fig. 6. The dealloying (discharge) capacity delivered by Li/Sn-film and Li/Sn-powder half-cells.
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